067  
FNCA52 TJSJ 170853  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
453 AM AST TUE SEP 17 2019  
   
DISCUSSION
 
 
ALTHOUGH A DRIER AIR MASS WITH SAHARAN DUST PARTICLES WILL ARRIVE  
TODAY, THE LINGERING MOISTURE OF AN EXITING TROPICAL WAVE WILL  
RESULT IN PASSING SHOWERS THROUGH THE MORNING. THE AVAILABLE  
MOISTURE COMBINED WITH LOCAL EFFECTS AND DIURNAL HEATING WILL  
RESULT IN SHOWERS AND THUNDERSTORMS ACROSS THE NORTHWEST QUADRANT  
OF PUERTO RICO DURING THE AFTERNOON. MINIMUM RELATIVE HUMIDITY  
VALUES WILL RANGE FROM THE MID 50S TO MIDDLE 60S, AND WINDS WILL  
BE OUT OF THE EAST TO EAST-SOUTHEAST AT 10 TO 15 MPH. THEREFORE,  
THE RISK OF FIRE DANGER IS LOW TODAY.  
 
PRZ014-180900-  
SOUTHEAST COASTAL PLAINS-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER MCLEAR CLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 20  
TEMP (24H TREND) 91 (+1) 76 (0) 90  
RH % (24H TREND) 59 (0) 87 (-2) 56  
20FTWND-VAL/AM(MPH) E 13 E 13  
20FTWND-RDG/PM(MPH) SE 13 E 8 SE 12  
MIXING HGT(FT-AGL/MSL)4269 4505  
TRANSPORT WND (MPH) SE 21 SE 16  
VENT RATE (KT-FT) 78261 67575  
DISPERSION 5 5  
DSI 6 5 6  
LAL 2 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ015-180900-  
SOUTHERN HILLS-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 89 (+1) 73 (0) 89  
RH % (24H TREND) 57 (-1) 89 (-5) 53  
20FTWND-VAL/AM(MPH) E 13 E 12  
20FTWND-RDG/PM(MPH) SE 13 E 7 SE 12  
MIXING HGT(FT-AGL/MSL)4939 5040  
TRANSPORT WND (MPH) SE 22 SE 17  
VENT RATE (KT-FT) 97940 82858  
DISPERSION 5 5  
DSI 6 4 6  
LAL 2 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ016-180900-  
NORTH COASTAL PLAINS-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 93 (+3) 76 (-2) 92  
RH % (24H TREND) 54 (-6) 87 (+1) 51  
20FTWND-VAL/AM(MPH) E 11 SE 10  
20FTWND-RDG/PM(MPH) E 11 SE 7 SE 11  
MIXING HGT(FT-AGL/MSL)5134 5756  
TRANSPORT WND (MPH) SE 16 SE 14  
VENT RATE (KT-FT) 85187 82260  
DISPERSION 5 5  
DSI 6 4 6  
LAL 2 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ017-180900-  
NORTHERN HILLS-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 40 0 20  
TEMP (24H TREND) 91 (+1) 73 (0) 92  
RH % (24H TREND) 55 (-2) 90 (-4) 49  
20FTWND-VAL/AM(MPH) E 10 SE 9  
20FTWND-RDG/PM(MPH) SE 10 SE 6 SE 10  
MIXING HGT(FT-AGL/MSL)5178 5726  
TRANSPORT WND (MPH) SE 17 SE 14  
VENT RATE (KT-FT) 82977 81045  
DISPERSION 5 5  
DSI 6 3 6  
LAL 2 1 1  
HAINES INDEX 3 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ018-180900-  
WEST COAST-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 50 0 20  
TEMP (24H TREND) 90 (-1) 77 (0) 89  
RH % (24H TREND) 60 (+3) 85 (-4) 57  
20FTWND-VAL/AM(MPH) E 10 G20 E 11  
20FTWND-RDG/PM(MPH) SE 12 G19 E 9 SE 12  
MIXING HGT(FT-AGL/MSL)4625 4889  
TRANSPORT WND (MPH) SE 20 SE 17  
VENT RATE (KT-FT) 94164 82836  
DISPERSION 5 5  
DSI 6 4 6  
LAL 2 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ019-180900-  
EASTERN INTERIOR-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 90 (+1) 73 (-2) 91  
RH % (24H TREND) 55 (-6) 92 (-1) 51  
20FTWND-VAL/AM(MPH) E 12 SE 11  
20FTWND-RDG/PM(MPH) SE 12 SE 6 SE 11  
MIXING HGT(FT-AGL/MSL)5028 5229  
TRANSPORT WND (MPH) SE 22 SE 16  
VENT RATE (KT-FT) 89946 73206  
DISPERSION 5 5  
DSI 6 3 6  
LAL 2 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ022-180900-  
LUQUILLO MOUNTAIN RANGE-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 88 (+3) 71 (-2) 88  
RH % (24H TREND) 61 (-2) 92 (-1) 55  
20FTWND-VAL/AM(MPH) SE 13 SE 11  
20FTWND-RDG/PM(MPH) SE 12 SE 8 SE 11  
MIXING HGT(FT-AGL/MSL)4357 4415  
TRANSPORT WND (MPH) SE 20 SE 17  
VENT RATE (KT-FT) 78354 70640  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ023-180900-  
CENTRAL MOUNTAIN RANGE-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 40 0 20  
TEMP (24H TREND) 89 (+2) 70 (0) 90  
RH % (24H TREND) 56 (+1) 91 (-4) 48  
20FTWND-VAL/AM(MPH) E 11 SE 11  
20FTWND-RDG/PM(MPH) SE 12 SE 7 SE 11  
MIXING HGT(FT-AGL/MSL)5317 5506  
TRANSPORT WND (MPH) SE 21 SE 16  
VENT RATE (KT-FT) 98860 81328  
DISPERSION 5 5  
DSI 5 2 6  
LAL 2 1 1  
HAINES INDEX 3 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ024-180900-  
CAYEY MOUNTAIN RANGE-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 87 (+1) 72 (-1) 89  
RH % (24H TREND) 59 (-4) 91 (-1) 55  
20FTWND-VAL/AM(MPH) E 12 SE 11  
20FTWND-RDG/PM(MPH) SE 12 SE 6 SE 11  
MIXING HGT(FT-AGL/MSL)4301 4692  
TRANSPORT WND (MPH) SE 20 SE 17  
VENT RATE (KT-FT) 73117 70380  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ025-180900-  
VIEQUES-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER MCLEAR CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 30  
TEMP (24H TREND) 90 (+1) 80 (-1) 90  
RH % (24H TREND) 59 (-4) 82 (-3) 59  
20FTWND-VAL/AM(MPH) E 17 SE 13  
20FTWND-RDG/PM(MPH) E 13 E 12 SE 13  
MIXING HGT(FT-AGL/MSL)3544 3519  
TRANSPORT WND (MPH) SE 21 SE 17  
VENT RATE (KT-FT) 62550 52575  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ026-180900-  
CULEBRA-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 20 30  
TEMP (24H TREND) 90 (+1) 81 (-1) 90  
RH % (24H TREND) 61 (-4) 83 (-2) 59  
20FTWND-VAL/AM(MPH) E 18 SE 14  
20FTWND-RDG/PM(MPH) SE 14 E 13 SE 13  
MIXING HGT(FT-AGL/MSL)3364 3464  
TRANSPORT WND (MPH) SE 23 E 21  
VENT RATE (KT-FT) 67280 62352  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ027-180900-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE TSTMS NONE SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 90 (0) 77 (0) 88  
RH % (24H TREND) 60 (+2) 85 (-5) 58  
20FTWND-VAL/AM(MPH) E 14 G21 E 14  
20FTWND-RDG/PM(MPH) SE 14 E 10 SE 13  
MIXING HGT(FT-AGL/MSL)4514 4698  
TRANSPORT WND (MPH) SE 24 SE 21  
VENT RATE (KT-FT) 92224 83429  
DISPERSION 5 5  
DSI 6 5 6  
LAL 2 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ001-180900-  
SAINT THOMAS AND SAINT JOHN-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 30  
TEMP (24H TREND) 89 (0) 78 (-2) 90  
RH % (24H TREND) 59 (-3) 83 (-3) 57  
20FTWND-VAL/AM(MPH) E 18 SE 13  
20FTWND-RDG/PM(MPH) SE 14 E 12 SE 12  
MIXING HGT(FT-AGL/MSL)3389 3382  
TRANSPORT WND (MPH) SE 24 E 20  
VENT RATE (KT-FT) 73370 60876  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 4 3  
 
REMARKS...NONE.  
 

 
 
VIZ002-180900-  
ST CROIX-  
453 AM AST TUE SEP 17 2019  
 
TODAY TONIGHT WED  
 
CLOUD COVER MCLEAR CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 30  
TEMP (24H TREND) 89 (+1) 76 (-3) 90  
RH % (24H TREND) 62 (-5) 93 (+4) 58  
20FTWND-VAL/AM(MPH) E 18 E 13  
20FTWND-RDG/PM(MPH) E 14 E 13 SE 12  
MIXING HGT(FT-AGL/MSL)4273 4162  
TRANSPORT WND (MPH) SE 24 SE 20  
VENT RATE (KT-FT) 89733 70754  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 4 3  
 
REMARKS...NONE.  
 

 
 

 
 
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